Stormwater ponds slow the flow of water, filter pollutants and improve stream health. Sediment (soil), excess nutrients and other pollutants are carried downstream, negatively affecting aquatic life. If unmanaged, stream banks begin to erode under the increased flows. Streams will rise to new peak flows (the maximum amount of discharge after a rain or snow). Why control runoff? When new roads and buildings are built, the increased amount and velocity of runoff can damage nearby streams. Today, there are at least 2,162 stormwater ponds in Fairfax County 1,325 are maintained by the county and the remaining ponds are privately maintained. ![]() In Fairfax County, the construction of stormwater ponds became a requirement for new development in the 1980s. Stormwater ponds capture, control and filter runoff from roofs, roads and parking lots before it enters our local streams.
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